Hello Sabu, i got the same problem cause i updated php and imp before installing the blade... Now it conflicts with the same packages... The only solution i got is to uninstall imp, php, then update the system and then you'll be able to reinstall php and imp without problem...
you need to uninstall the packages that conflicts with the blade... if they are some dependencies, you'll need to uninstall these packages too...
i didn't try cause i'm lazy of fighting against this amazing system, i got a new install and don't want to destroy everything (this is already my 5th install of SME 5.1.2 in 15 days !!!)... :Þ
Bye